Cement spray device



J. E. SMITH CEMENT SPRAY DEVICE Filed March 12, 1936 INVENTO I,

ATTORNEY July 26, 1938.

Patented July 26, 1938 ilNiTED srares s-ArsNT caries 2,124,389 CEMENT SPRAY DEVICE John E. Smith, Los Angeles, Calif.

Application March 12, 1936, Serial No. 68,361

11 Claims.

My invention relates primarily to a device for applying cementor like plastic materials in which the cement or the like is transported in a dry state through a hose and hydrated at the 5, point of a nozzle and then applied in a spray form, such devices being variously called cement guns etc, and its prime object is the provision of means, in such devices, whereby the fluid being supplied to the stream of aggregates passing through the nozzle may be maintained at a relatively high pressure at least not lower'than the line pressure, while permitting the volume to be varied.

Another object is to provide means of the above character whereby the fluid being commingled with the stream of aggregates will be caused to fan out or spread as it passes out of the jet into the nozzle, this fanning out or spreading being at right angles to the flow of the stream of aggregates, the result being a substantially perfect mixture of fluid and aggregates with a resultant uniform hydration.

Heretofore in the use of so called cement guns etc., in applying cement and like plastic materials, fluid has been added to the stream of aggregates, passing through the nozzle, through a plurality of openings or jets positioned radi-.

ally around the nozzle and angled in the direction of flow of the aggregates and, when it was desired or found necessary to alter the proportion of fluid and aggregates, the flow of fluidwas increased or decreased by means of avalvein the main supply. a a

This, of course, decreased or increased the pressure of the jets passing into the nozzle with the result that the fluid, in the case of decreased pressure, would fail to penetrate sufliciently into the stream of aggregates to permit a thorough commingling, the result being that the outer surface of the stream of aggregates would be too wet, and the inner portion too dry.

In the use of my invention I provide means for varying the capacity or transverse area of the jet openings as individual openings so that as the fluid supply is varied the transverse area or capacity of the individual jet openings is also varied and the pressure of the fluid passing therethrough maintained or adjusted as desired and at the same time the fluid as it passes out 55 will be understood that I do not limit. myself to of the outlets is caused to. fan or spread fan such preferred form but that various changes and adaptations may be made therein without departing from the spirit of my invention.

In the drawing accompanying and forming a part hereof:

Fig. 1 is a side elevation of a cement gun constructed according-to my invention.

Fig. 2 is a left hand elevation of Fig. 1.

Fig. 3 is a central transverse section through my improved fluid control.

Fig. 4 is a central vertical section through Fig. 3 and taken at right angles thereto.

Fig. 5 is a detail of a portion of Fig. 3.

Fig. 6 is a fragmentary detail of a modified form of my invention.

Referring to the drawing my device comprises an outer housing 8 provided with an interior fluid chamber 9. Projecting from the lower portion of the housing 8, is an integral boss is through which is provided an opening it, interiorly screw threaded for connection to a street L i2 by means of which said chamber is connected to. a fluid supply pipe l3. A control valve (not shown) is inserted in the supply pipe line, the object of which will be obvious.

Provided in the opposite sides it and it of the housing 3 are openings l6 and ii, which openings are concentric relatively to each other, and mounted at its ends in these openings it and ii, held positioned by any suitable or desired means, such as soldering, friction or otherwise, is the jet-opening ring or carrier is, in which are provided the radially extending jet openings 26 of which I have shown eight, equally spaced, but any other number may be used as found necessary or advisable, and any desired spacing may also be used. Provided through the carrier 69 is a passage 2! through which the aggregates are forced during admixture with the fluid. Mounted within the chamber 9 to snugly fit around the ring or carrier i9 is the jet adjusting valve member 22, through which are provided jet openings 23 adapted to coincide with the openings 26 of the ring l9 and provide a continuous passage from within the chamber 9 to the passage 2!. Extending upwardly from the side of member 22 is an abutment 2 and this abutment projects through an elongated opening 25 in the wall of housing 8 and terminates at a short distance thereabove. mounted upon the housing 8 to inclose the elongated opening 25 and the abutment E l-is a closure cap 26, held positioned by screws or studs 2'! and nuts 28, soldering or the like being used if found necessary'or desirable to make the connection Detachably or union therebetween watertight. Cap 26 is also provided with a removable closure plate 29. Provided in opposite ends of the cap 29 are bosses 33 and 3| and screw threadedly mounted in the boss 30 is an adjusting screw 32, provided on its outer end with a hand wheel 33, a packing gland 34 being provided for insuring a fluid tight connection between the projecting end of the screw 32 and the housing or cap 26. Screwthreadedly mounted in the boss 3| is an adjusting sleeve 35, provided on its outer end with a lock nut 36 by means of which said sleeve may be locked against movement relative to boss 3|. Projecting through the sleeve 35, concentric therewith and in screwthreaded engagement therewith is an elongated stop member 31, the inner end of which acts to limit the rotative movement of the member 22 by means of the abutment 24. The other end of the stop member 31 projects beyond the outer end of the sleeve 35 and is squared or other wise adapted for the reception of or engagement by a suitable tool for rotating the same.

A look nut 38 is provided for the member 31 whereby the same may be locked against relative movement with sleeve 35. Coiled around the stop member 37 between the inner end of the sleeve 35 and the adjacent side of the abutment 24 is a coil spring 39 which normally acts to hold the abutment 24 against the adjusting screw 32.

While I have shown and described the jet openings 20 and 23 as being circular it will be understood that I do not intend to confine myself to any specific contour but that I may also use slitted apertures extending radially or transversely or in any other manner desired or found advisable. (See Fig. 6.)

In the operation of my device should it be desired to vary the area of the jet openings, the rotation of the adjusting screw 32 by means of the hand wheel 33 will rotate the jet adjusting valve member 22 and move its jet openings 23 into or out of register with the jet openings 20, according to whether it is desired to increase or decrease the area.

Interiorly screw threaded extensions 40 and 4|, projecting from the sides of housing 8 and concentric with passage 2| provide means for connection to the nozzle 42 of any suitable construction and the aggregate supply pipe or tube 43.

Having described my invention'what I claim is:

1. In a device of the character described a housing, having a fluid chamber therein and a connection from said fluid chamber to a fluid supply, a detachable annulus rigidly mounted in said housing and having a central opening therethrough and a plurality of radially extending fluid passages connecting said central opening to said fluid chamber, an adjusting member mounted in said fluid chamber to surround said annulus and being provided with a plurality of radially extending fluid. openings there adapted to register with the said first fluid passages, and means for rotating said adjusting member to bring the fluid openings therein into or out of register with the fluid passages of said annulus and restrict or increase the flow of fluid therethrough.

2. In a cement spray device, a housing having a passage therein for dry aggregates, a fluid chamber in said housing and having a plurality of jet orifices opening into said passage, a valve' member movable in said chamber for simultaneously varying the area of all of said jet orifices, and means operable exteriorly of said housing for so moving said valve member.

3. In a cement spray device, a housing having extending therethrough a passage for dry aggregates, a fluid chamber having jet orifices arranged to direct jets of fluid under pressure into said passage, means for establishing connection of said chamber with a source of fluid under pressure, a valve member movable relative to said orifices for simultaneously varying the area of said orifices, and means for moving said valve member.

4. In a cement spray device, a housing having extending therethrough a passage for dry aggregates, a fluid chamber having jet orifices opening into said passage, means providing for connection of said chamber with a source of fluid under pressure, a valve member having a plurality of openings adapted to register with and communi" cate said jet orifices with said chamber, and

means for moving'said valve member to simul taneously vary the volume of the fluid jets.

5. In a cement spray device, a housing having a passage'for dry aggregates, a fluid chamber located between the ends of and surrounding said passage and having fluid jet orifices opening into said passage, means providing for connection of said chamber with a source of supply under pressure, means at opposite ends of said housing and said passage therein providing for connection of the housing with a nozzle and a dry aggregate feed conduit, a rotary valve member in said chamber and having openings which are adapted to register with said jet orifices and to vary the fluid volume of the jets, and means operable exteriorly of said housing for turning said valve member.

6. In a cement spray device, a housing having a passage through which dry aggregates are passed, a fluid chamber adjacent said passage and having jet orifices arranged to discharge into said passage, a movable valve member having openings adapted to be brought into and out of registration with said orifices upon movement of said valve, and means operable exteriorly of said housing for moving said valve.

7. In a cement spray device, a housing having a passage therethrough for dry aggregates, a fluid chamber located between the ends of said passage and including an annular wall which is removably mounted in said housing, said annular wall having a plurality of jet orifices arranged to discharge into said passage, an annular valve member surrounding and being rotatable relative to said annular wall and having openings therein adapted to communicate the said orifices with the interior of said chamber, and means for rotating said valve member.

8. In a cement spray device, a housing having a passage for dry aggregates, a fluid chamber in said housing, means providing for connection of said chamber with a source of fluid under pressure, and means for directing jets of fluid from said chamber into said passage including a stationary member having orifices therein, a movable member having openings adapted to establish communication of said orifices with said chamber, and means operable exteriorly of said housing for moving said movable member.

9. In a cement spray device, a housing having a passage for dry aggregates, a fluid chamber in said housing, means providing for connection of said'chamber with a source of fluid under pressure, and means for directing jets of fluid from said chamber into said passage including a stationary member having orifices therein, a movable member having openings adapted to establish communication of said orifices with said chamber; and means operable exteriorly of said housing for moving said movable member, said stationary member being removable through said passage.

10. A cement spray device comprising a housing having a passage through which dry aggregates are passed, a fluid chamber adjacent said passage, adapted for connection with a source of fluid under pressure and having a jet orifice for discharging fluid into said passage, and means for varying the volume of the jet while maintaining the normal fluid chamber pressure of the fluid passing therethrough comprising a valve member movable relative to and cooperating with said orifice and means operable at will upon the exterior of said housing for adjusting said valve.

11. A cement spray device comprising a housing having a passage for dry aggregates, a fluid chamber adjacent to said passage having a jet orifice for discharging fluid into said passage, means adapted for connecting said chamber with a source of fluid under pressure and for maintaining a substantially uniform pressure therein at least lower than the line pressure from said source, and means for maintaining a relatively high jet pressure while varying the volume of the jet including a valve associated with said orifice and valve adjusting means arranged for actuation during cement spraying operations. JOHN E. SMITH. 

